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Stockholders' Equity (Narrative) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
0 Months Ended9 Months Ended
Oct. 12, 2011
Apr. 19, 2011
Sep. 30, 2011
Sep. 30, 2010
Stockholders' Equity    
Dividend declared per share$ 0.14   
Dividends payment dateNov. 22, 2011
Dividends payable record dateOct. 26, 2011
Dividend declared dateOct. 12, 2011
Options granted 410  
Stock options strike price, per share $ 35.00  
Closing stock price on date of grant, per share $ 31.78  
Options vesting and exercisable, maximum (in years)  eight 
Options termination period after the end of the relevant vesting period (in months)  13 
Total stock-based compensation expense for the Fastenal option plan  $ 2,925$ 3,015
Unrecognized compensation expense  $ 16,214 
Weighted average period over which total unrecognized compensation expense will be recognized (in years)  4.86